package edu.nf.takeoutdemo.service.impl;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import edu.nf.takeoutdemo.commons.properties.WeChatProperties;
import edu.nf.takeoutdemo.commons.utils.HttpClientUtil;
import edu.nf.takeoutdemo.mapper.UserMapper;
import edu.nf.takeoutdemo.model.dto.UserLoginDTO;
import edu.nf.takeoutdemo.model.entity.User;
import edu.nf.takeoutdemo.service.UserService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author zjl
 * @date 2025/10/27
 */
@Service
@RequiredArgsConstructor
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    private final WeChatProperties weChatProperties;

    private final UserMapper userMapper;
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获取当前用户的openid
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if (openid == null) {
            throw new RuntimeException("登录失败");
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);
        //如果是新用户，自动完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .name(userLoginDTO.getName())
                    .avatar(userLoginDTO.getAvatar())
                    .build();
            userMapper.add(user);
        }
        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code) {
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
